ARTICLE Function Composing Swift 2.0 - 5

article-function-composing-5.swift

infix operator >>> { precedence 50 associativity left }

public func >>> <A,B,C>(left: A throws -> B, right: B throws -> C) -> (A throws -> C) {
    return { (parameter: A) throws -> C in
        return try right(left(parameter))
    }
}

let data = ...

let handleResponse = parseJSONFromNSData >>> validateJSONResponse >>> unmarshalJSON(Model.self)
let model = try handleResponse(data)